Among them were two Singaporean men, aged 51 and 54, found inside a room of a house suspected of being a "heroin store" in the vicinity of Upper Serangoon Road. Officers recovered a total of about 124g of heroin and a small amount of 'Ice', estimated to be worth more than $13,000, from within this room.

The drugs seized across all four days included about 400g of heroin, 15g of 'Ice', 92g of cannabis, and 37 Erimin-5 tablets. Investigations are currently ongoing.